Tension device for newspaper-roll stands



July 24, 1928.

c. A. DRESSER ET AL TENSION DEVICE FOR NEWSPAPER ROLL STANDS Filed Nov. 23, 1926 INVENTORS mlw -06mm QM ATTORNEY Patented July 24, 1928.

UNITED STATES 1,678,109 PATENT OFFICE.

CHARLES A. DRESSER, OF GREENIBURG, NEW YORK, AND EDWIN W. HAMMER, OF SOUTH ORANGE, NEW JERSEY, ASSIGNORS TO GLINE ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TENSION DEVICE FOR NE Application filed November 2 110 have been combined our novel tension devices; Fig. 2 is a diagram assisting to an understanding of our invention. Fig. 3 is a diagram showing an alternative method of connection. High speed printing presses of the type employed in printing newspapers and the like are usually supplied with a web of paper drawn by the press from a large roll weigh ing in the neighborhood of 2000 pounds. W This paper runs at a high rate of speed, 1200 feetper minute, more or less, and the heavy rolls of paper consequently rotate at high speed an with great momentum. With these high speed presses it is frequently the 26 practice to mount a plurality of these large rolls of'paper upon a roll stand so arranged that as one roll becomes depleted a second roll may be brought into" operative position by the partial rotation of the'reel of such 30 roll stand, the depleted roll being then removed and a fresh roll substituted for it. While our invention is especially designed for use with such a roll stand it is also adaptable to the decker'type of presses, without rotatable roll stands.

As is well understood in this art, the weight and speed ofrotation of the rolls of web paper introduce a condition which is frequently troublesome in that the momen- 4 tum of the rapidlyrotating and heavy roll of paper willtend to persist when the press is to be stopped, causing an overrunning of the web sheet with a tendency to floo the press with loose paper. This occasions;

4 loss of time and material.

It is the object of our invention to overcome this tendency of the web roll to over-- run when the press is stopped or is havingits Speed reduced, possibly in anticipation of shut-down, and the preferred meansselooted by us for accomplishing this purpose are illustrated in the accompanying drawings in which Fig. 1 represents an-en elevation of a roll stand for a printing press WSPAPER-BOLL szrsnn's.

e, 1926. Serial in. 150,213. I

which includes a rotatable reel upon which are mounted a plurality of rolls of web paper. In connection with the roll stand we employ a frame suspended at its upper end and carrying two pulleys, one at either end of the frame, with arr endless belt extending between and over these two pulleys. The

frame with its pulleys and belt is so located I that one side of the belt may rest by gravity against the surface of the active roll of paper and derive power therefrom. The greater the amount of power absorbed by the belt from the rotating paper the" greater will be thedrag or braking eflect upon the roll armature terminals at a pre-determincd strength of field magnetism. We prefer to use a separately excited generatorfor this purpose although we do not wish to limit ourselves in this respect.

As is well known, the usual high speed printing press is electrically. driven and is electrically controlled by the press'operator who has available certain switch buttons through which he can regulate the operation of the press including the stopping of the press quickly, in case of emergency. Accordingto our invention we connect oneof the elements of'the generator, either field or armature, through the press control devices in such a manner that the actuation of the press-stopping switch, for example, will change the electrical conditions of the gen; erator to permit it to absorb more mechanical energy from ii-ts driving belt and connecting roll of web paper, thus increasing the braking efi'ect of the traveling belt which rests upon such roll. Fig. 2 of the drawings shows a schematic arrangement for efiecting this result. It will be understood that there may be a plurality of controls from the press to meetconditions imposed by stopping or 'merely'decelerat-ing thepre'ss; or the same or similar regulating devices may be actuated when the press is to be stopped or merely decelerated. I

to our invention the shaft Referring particularly to the drawings, Fig. 1 shows an end view of a roll stand for printing presses comprising a reel mounted on pedestals 2 'and carrying near its ends a set of roll supporting arms 3 adapted to receive rolls of paper 4. The position of the rolls is controlled by an electric motor 7 which through suitable gearing engages with the gear wheel 7 attached to the shaft 1. The margin of the printed page is regulated by another motor 8 arranged to shift the shaft 1 with its arms 3 and paper rolls 4: lon- I gitudinally in its bearings.

Fig. 1 also shows a frame 12 pivoted at its upper end, and carrying pulleys 12 and 12 around which is passed a belt 9, such belt resting against the surface of the roll 4 from which the web 4: is being drawn into the press. As will be understood from this drawing, the frame 12 is mounted upon the shaft 10 but the only power for such shaft 10 is the power supplied by the belt 9 through the contact of such belt with the rotating roll 4 of paper. The frame 12 may be provided with an eye 13 to serve as a means for withdrawing the belt 9 out of contact with the roll. The shaft 10 is. supported in bearings 11. Driven by the shaft 10 is a dynamo electric generator 14 adapted to'absorb the mechanical energy transmitted through the frictional contact of the belt 9 with the active roll of web paper. In Fig. 2 we have shown, diagrammatically, the generator 14 with its armature A and field magnet winding F. The armature is shown with its commutator! brushes connected to a resistance R, while the field magnet winding is illustrated as in series with a resistance R The resistance R may be 'short-circuited by a switching device M, the winding of which should be energized when the control button on the press is actuated, as to stop the press. It will be understood that such actuation is to result in the short circuiting of the rheostat R, which will give a material increase in generator field magnetism with a consequent increase in current supplied by the armature A to the rheostat R If, however, as indicated above, it be desired to manipulate the circuit of the armature A of the generator 14. instead of v the field magnet winding F of such generator, it is only necessary to disconnect the circuit closing contacts of the switching device M of Fig; 2 from the terminals of the resistance R, and connect such contact terminals so as to short circuit all or part of the rheostat B, when the switching device Mis actuated through the press'control circuits. The effect of such short circuiting of the resistance R will be to increase the generator output and thereby impose an added load to the belt 9 for the frictional control of the web-roll 4. At the same time, the speed-responsive device-the governor Another improvement secured through our invention is in the automatic reduction of the resistance of the external circuit to the armature A of the generator 1 1 as the generator speed is reduced. It will be understood that the decrease of speed of rotation of the roll of paperas the press-speed is cut downis accompanied by a decrease of generator speed; this, in turn, decreases the generator voltage developed and this diminishes the current output through the resistance R,. We prefer to counter-balance this decrease in generator voltage, within practical limits, by automatically cutting outas by short-circuitingportions of the rheostat 1t, forming the external circuit for the armature A. This may be done by utilizing the centrifugal governor G of Fig.

2, driven from the web-roll either directly or indirectly, as from the shaft 10. As the web-roll speed decreases the weights of the centrifugal governor G force down the end of the regulating arm of the switch S, causing the other end of such arm to traverse a succession of switch contacts which either directly or through relay switches will progressively short-circuit sections of the rheostat R,. We do not wish to limit ourselves to the precise electrical connections shown as various modifications thereof are possible in the follow-ing of our invention.

What we claim is asfollows:

l. A tension device for newspaper: roll stands comprising a frame pivoted at one end, a pulley at each end of said frame, a belt carried by said pulleys and contacting with and driven exclusively by a roll of paper carried by the roll stand, ashaft driven by one belt pulley, a dynamo connected to said shaft, a resistance to receive and limit the dynamo current to impose a dynamic braking upon said shaft and means for automatically increasing the dynamo output when the press is to be stopped.

2. A tension device for newspaper roll stands comprising a frame pivoted at one end, a pulley at each end of said frame, a belt carried by said pulleys and contacting with and driven exclusively by a roll of paper carried by the roll stand, a dynamo receiving its driving power from such belt, and means for increasing the load upon the dynamo when the press is to be stopped.

3. An electrodynamic tension apparatus sponsive device actuated by the web-roll and a dynamo electric generator receiving its driving power from such belt, a rheostat connected to one of the generator elements to limit the normal current flow therethrough, and means for changing the efl'ective resistance of such rheostat when the press is to be decelerated.

4:. An electrodynamic tension apparatus for the web roll of a printing press comprising a belt driven by contact with such roll, a dynamo electric generator receiving its driving power from such belt, an external load circuit for such generator, a speed-rea switch controlled by the speed-responsive device for varying the eifective resistance of the external load circuit of the generator.

5. An electrodynamic tension apparatus for the web-roll of a printing press comprising a belt driven by contact with such roll, a dynamo electric generator receiving its driving force from such belt, a rheostat connected to one of thegenerator elements to limit the current flow therethrough, a speed-responsive device actuated by the web- I roll and a switch controlled by the speedresponsive device for varying the effective resistance of such current limiting rheostat.

6. An electrodynamic tension apparatus for the web-roll of .a printing press comprising a belt driven by contact with such roll, a dynamo electric generator receiving its driving power from such belt, a resistance device connected to one of the generator elements to limit the current flow therethrough, means for changing the electrical constants of that circuit when the press is to be stopped, a second resistance device connected to the vother generator element, a speedresponsive deviceactuated by the rolland a. switch controlled by the speed-responsive device for varying the effective resistance of such second resistance device.

7. A tension device for newspaper roll stands comprising a frame pivoted at its upper end, a pulley at each end of said frame, a belt carried by said pulleys and contacting with and driven exclusively by a roll of paper carried by the roll stand, a shaft driven by said upper belt pulley, a dynamo driven from said shaft, a resistance through which the dynamo current passes to impose a dynamic braking upon said shaft, and means for automatically reducing the resistance when the shaft speed is reduced.

8. An electro-dynamic tension apparatus for theweb roll of a printing press comprising a belt driven by contact with such roll, a dynamo electric machine receiving its driving power from such belt, a resistance connected to the armature circuit to receive and limit the current flow therefrom, and means for changing the electrical constants of that circuit when the press is to be stopped.

9. An electro-dynamic tension apparatus for the web roll of a printing press comprising a belt driven by contact with such roll, a' dynamo electric generator receiving its driving powerlfrom such belt, a resistance device connected in the field circuit to limit the current flow therethrough, means for changing the electrical constants of that circuit when the press is to be stopped, a second resistance device connectedto the armature to receive and limit the current flow therefrom, a speed-responsive device actuated" by the roll anda switch controlled by the speed-responsive device for varying the effective resistance of the armature resistance device. y

CHARLES A.- DRESSER. EDWIN w. HAMMER. 

